David J. Helfand - books and biography
David J. Helfand - books and biography
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2 products
Paper book «The Universal Timekeepers: Reconstructing History Atom by Atom», author David J. Helfand – фото №1
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Paper book «A Survival Guide to the Misinformation Age: Scientific Habits of Mind», author David J. Helfand – фото №1
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